twitter-bootstrap折叠在首次单击后停止工作

首先，我要感谢TwitterBootsrap团队所产生的成果，但是文档需要做更多的工作.

At first I would like to say thank you to the TwitterBootsrap team for what they are producing but the documentation need much more work.

我的网站上有该网站示例的代码:

I am having the code of the site example at my site:

<div class="accordion" id="accordion2">
                <div class="accordion-group">
                  <div class="accordion-heading">
                    <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion2" href="#collapseOne">Collapsible Group Item #1</a>
                  </div>
                  <div id="collapseOne" class="accordion-body collapse in">
                    <div class="accordion-inner">
                      Sentence 1
                    </div>
                  </div>
                </div>
                <div class="accordion-group">
                  <div class="accordion-heading">
                    <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion2" href="#collapseTwo">Collapsible Group Item #2</a>
                  </div>
                  <div id="collapseTwo" class="accordion-body collapse">
                    <div class="accordion-inner">
                      Sentence2
                    </div>
                  </div>
                </div>
                <div class="accordion-group">
                  <div class="accordion-heading">
                    <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion2" href="#collapseThree">Collapsible Group Item #3</a>
                  </div>
                  <div id="collapseThree" class="accordion-body collapse">
                    <div class="accordion-inner">
                      Sentence3
                    </div>
                  </div>
                </div>
              </div>

问题在于手风琴的每一行仅打开和关闭一次，然后手风琴变得无用.我在做什么错了?

The problem is that each row of the accordion opens and closes only once and then the accordion becomes useless. What am I doing wrong?